Email infrastructure you can trust
Flowvaro is building the enterprise email delivery platform that should have existed years ago -- self-hosted, transparent, and built on open technology.
Our Mission
Email is critical infrastructure. Businesses depend on it for customer communication, marketing, and revenue. Yet most email platforms are expensive, opaque, and lock you into their cloud with no self-hosted option.
Flowvaro exists to change that. We are building a complete email delivery and marketing automation platform that you can run on your own servers, with pricing that scales to millions of emails without bankrupting your team.
What We Believe
Deliverability First
Every architectural decision we make prioritizes inbox placement. From KumoMTA at the core to our 3-layer DKIM defense, we never compromise on deliverability.
Self-Hosted Freedom
Your email infrastructure should be yours. Flowvaro runs on your servers, your data stays in your datacenter, and you control the entire stack.
Developer Experience
Sub-12ms API latency, SDKs in 6 languages, comprehensive documentation, and a CLI that fits into any CI/CD pipeline. Built by developers, for developers.
Transparent Pricing
No per-recipient charges, no hidden fees, no surprise overages. You pay for what you send, and you always know what the next bill will be.
Privacy by Design
Self-hosted AI models mean your data never leaves your infrastructure. GDPR-compliant out of the box. Audit logging for every action.
Open Technology
Built on open-source foundations: KumoMTA, PostgreSQL, ClickHouse, Kafka, and Redis. No proprietary lock-in, no black boxes.
Our Team
A small, focused team with deep experience in email infrastructure, distributed systems, and developer tools.
Engineering
Backend, MTA, infrastructure
Product
Design, UX, frontend
Deliverability
Reputation, compliance, ISP relations
Built on Proven Technology
No proprietary black boxes. Every component in the Flowvaro stack is a battle-tested open-source technology.
High-performance Rust-based MTA with Lua policy engine. Handles millions of messages per hour.
Microservices architecture with chi router, pgx driver, and structured logging via slog.
Row-level security for multi-tenancy, JSONB for flexible schemas, UUID primary keys.
Column-oriented database for real-time analytics on billions of email events.
Decoupled event processing for bounces, webhooks, analytics ingestion, and campaign triggers.
App Router with shadcn/ui, Recharts dashboards, GrapesJS email editor, and Monaco code editor.
Join the Team
We are always looking for talented engineers who care about email deliverability, developer experience, and building reliable infrastructure. Remote-friendly.
Get in Touch